Note 3 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Property, plant and equipment, gross	$ 373	$ 396
Less accumulated depreciation	217	192
Property, plant and equipment, net	156	204
Machinery and Equipment [Member]
Property, plant and equipment, gross	$ 370	393
Machinery and Equipment [Member] \| Minimum [Member]
Property, plant and equipment, Depreciable Lives (Year)	3 years
Machinery and Equipment [Member] \| Maximum [Member]
Property, plant and equipment, Depreciable Lives (Year)	7 years
Furniture and Fixtures [Member]
Property, plant and equipment, gross	$ 3	$ 3
Furniture and Fixtures [Member] \| Minimum [Member]
Property, plant and equipment, Depreciable Lives (Year)	5 years
Furniture and Fixtures [Member] \| Maximum [Member]
Property, plant and equipment, Depreciable Lives (Year)	7 years

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

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